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Figure 5 in A Continued Study Of Amphipod Life Histories In The Daugava River Under Varying Meteorological Conditions

Figure 5. Seasonal variation of the average brood size and average size of ovigerous females (mm) of A – Gammarus varsoviensis and B – Pontogammarus robustoides in 2020.

Figure 2 in A Continued Study Of Amphipod Life Histories In The Daugava River Under Varying Meteorological Conditions

Figure 2. Average air temperature and average water temperature of the study sites in the Daugava River during the study (2017–2020) in Latvia. Air temperature prepared according to data from Latvian Environment, Geology and Meteorology Centre, 2017, 2018, 2019, 2020

Figure 4 in A Continued Study Of Amphipod Life Histories In The Daugava River Under Varying Meteorological Conditions

Figure 4. Seasonal occurrence (%) of females, ovigerous females, males, immature and juvenile, A – Gammarus varsoviensis and B – Pontogammarus robustoides in 2020.

Figure 3 in A Continued Study Of Amphipod Life Histories In The Daugava River Under Varying Meteorological Conditions

Figure 3. Seasonal population structure of A – Gammarus varsoviensis and B – Pontogammarus robustoides by size (mm) in 2020.

Fig. 5 in Effects Of The Environmental Variables On The Alien Amphipod Pontogammarus Robustoides In The Daugava River And Its Reservoirs

Fig. 5. Ordination diagramm of RDA between data of the individual size groups of P. robustoides and environmental variables identified as significant (p<0.05) by Monte Carlo permutation test for study area. PR, P – Pļaviņas Reservoir, Pikstere, PR, VB - Pļaviņas Reservoir, Vārpu backwater, PR, GB - Pļaviņas Reservoir, Gobena backwater, PR, US - Pļaviņas Reservoir, upper stretch, DK – Daugava River, Klidziņa, KR, N – Ķegums Reservoir, Ņega, KR, G – Ķegums Reservoir, Graužupīte, RR, T – Riga Reservoir, Tome, RR, O - Riga Reservoir, Ogre, DR – Daugava River, Riga; ORP – oxred potential

Fig. 3 in Effects Of The Environmental Variables On The Alien Amphipod Pontogammarus Robustoides In The Daugava River And Its Reservoirs

Fig. 3. Seasonal changes of the physico-chemical parameters and relative water level in the Pļaviņas Reservoir.

Fig. 2 in Effects Of The Environmental Variables On The Alien Amphipod Pontogammarus Robustoides In The Daugava River And Its Reservoirs

Fig. 2. Seasonal changes of the water level in the Daugava River (the hydrological station at Jēkabpils) and the Pļaviņas Reservoir (the hydrological station at Pļaviņas).

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Fig. 4 in Number And Dynamics Of Zooplankton Taxa In The Daugava River And Pļaviņas Reservoir

Fig. 4. Species abundance after Shannon-Wiener index. Research was supported by the national research programme "The influencing factors in large rivers that determine value and dynamic of Latvia's ecosystems under the number of zooplankton, in particular changing climate – EVIDEnT" Sub-project 4.6. crustaceans, is the river hydrology and predators Freshwater ecosystem services and biological (Baranyi et al. 2002, Basu & Pick 1996, Chang diversity. et al. 2001, Lair 2006, Saunders & Lewis 1988, Thorp & Casper 2003, Thorp & Mantovani 2005, Viroux 2002). REFERENCES

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Fig. 1 in Seasonal Changes In Zooplankton Community Of The Daugava River

Fig. 1. Water discharge and level recorded dur- Fig. 2. Water temperature recorded during the ing the study period (according to information study period (according to information provided provided by the company "Latvian Environment, by the company "Latvian Environment, Geology Geology and Meteorology Centre"). and Meteorology Centre").

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Fig. 3 in Seasonal Changes In Zooplankton Community Of The Daugava River

Fig. 3. Abundance of zooplankton taxonomic Fig. 5. The share (in percentage terms) of taxo- groups and Shannon-Wiener index in the Dau- nomic groups in the Daugava River zooplankton gava River during different seasons. abundance during different seasons.

Figure 1 in A Continued Study Of Amphipod Life Histories In The Daugava River Under Varying Meteorological Conditions

Figure 1. Sampling sites of amphipods along the Daugava River (2017–2020).

Fig. 1 in Effects Of The Environmental Variables On The Alien Amphipod Pontogammarus Robustoides In The Daugava River And Its Reservoirs

Fig. 1. The study area and sampling sites in the Daugava River and its reservoirs in Latvia, 2016.

Fig. 4 in Effects Of The Environmental Variables On The Alien Amphipod Pontogammarus Robustoides In The Daugava River And Its Reservoirs

Fig. 4. Seasonal changes of individuals groups by body length in the Pļaviņas Reservoir.

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Fig. 1 in Number And Dynamics Of Zooplankton Taxa In The Daugava River And Pļaviņas Reservoir

Fig. 1. Localities of sampling sities in 2014 and 2015.

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Fig.4 in Distribution Of Scolytus Ratzeburgi Janson, 1856 (Coleoptera: Curculionidae, Scolytinae) In The Nature Park "Daugavas Loki"

Fig.4. Distribution of Scolytus ratzeburgi Janson, 1856 in the Nature Park " Daugavas loki"

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Fig.3 in Distribution Of Scolytus Ratzeburgi Janson, 1856 (Coleoptera: Curculionidae, Scolytinae) In The Nature Park "Daugavas Loki"

Fig.3. Location of birch stands in the Nature Park "Daugavas loki"

FIGURE 10 in Description of a new species of Cottus Linnaeus (Cottidae) from the Western Dvina / Daugava River system, Baltic Sea basin, based on integrative taxonomy

FIGURE 10. The skeleton of Cottus dorofeevi, ZIN 56917, Ovsyanka River, tributary of the Western Dvina / Daugava.

FIGURE 9 in Description of a new species of Cottus Linnaeus (Cottidae) from the Western Dvina / Daugava River system, Baltic Sea basin, based on integrative taxonomy

FIGURE 9. Illustration of the holotype of C. dorofeevi (ZIN 56916): (a) lateral view; (b) dorsal view of the head.

FIGURE 8 in Description of a new species of Cottus Linnaeus (Cottidae) from the Western Dvina / Daugava River system, Baltic Sea basin, based on integrative taxonomy

FIGURE 8. Bayesian inference for European representatives of genus Cottus (including closely related C. sibiricus) reconstructed using COI sequences. The values of the posterior probability (left) and the bootstrap support (right) are indicated for nodes. The results of species delimitation analyses (ASAP and bPTP) are presented as vertical bars.

FIGURE 6 in Description of a new species of Cottus Linnaeus (Cottidae) from the Western Dvina / Daugava River system, Baltic Sea basin, based on integrative taxonomy

FIGURE 6. The Bayesian tree of freshwater Cottoidei reconstructed using COI sequences. The topologies of the BI and ML trees were generally concordant. For each node, the values of the posterior probability (left) and the bootstrap support (right) are indicated.